如何使用SQL Server截断字符串

Question

我在SQL Server中有大字符串.我想将该字符串截断为10或15个字符

原始字符串

this is test string. this is test string. this is test string. this is test string.

期望的字符串

this is test string. this is ......

Answer 1

如果您只想返回长字符串的几个字符,可以使用:

select 
  left(col, 15) + '...' col
from yourtable

请参阅SQL Fiddle with Demo.

这将返回字符串的前15个字符,然后将其连接...到结尾.

如果你想确保小于15的字符串没有得到,...那么你可以使用:

select 
  case 
    when len(col)>=15
    then left(col, 15) + '...' 
    else col end col
from yourtable

请参阅SQL Fiddle with Demo

Answer 2

您可以使用

LEFT(column, length)

要么

SUBSTRING(column, start index, length)

Answer 3

您还可以使用 Cast() 操作：

 Declare @name varchar(100);
set @name='....';
Select Cast(@name as varchar(10)) as new_name